Notices of Memoirs — Age of Victorian Tertiaries. 519 



the younger and not the older member, as he asserts. The strati- 

 graphical facts are unimpeachable. 



The Mount Gambier limestones must, as the contained Mollusca 

 show, be associated with the Balcombian of Muddy Creek. The 

 polyzoal limestone of Muddy Creek rests on quartz porphyry, and is 

 the basal member of the series. It has been traced by Dr. Pritchard 

 and myself passing under the more loosely compacted beds of the 

 district, and is inseparable from them. 



The polyzoal limestones of Jan Juc, Waurn Ponds, and a few other 

 places are Janjukian, and the evidence rests on the Mollusca, but this 

 has no bearing on Mr. Chapman's main contention. 



The relative age of the Janjukian and Balcombian is a difficult 

 question. M'Coy, Tate and Dennant, and Chapman consider the 

 Janjukian the younger. Dr. Pritchard and myself consider the 

 reverse to be the case. 



As regards the other formations, it may be briefly said that the 

 estimate of their age depends on that of tlie Barwonian. If this be 

 Eocene, they are Miocene and Pliocene respectively ; if not, they 

 must be placed higher in the scale. 



(4) Discussion- on the Age and Sequence of the Victorian 

 Tertiaries. By G. B. Pritchard, D.Sc, Lecturer in Geology, 

 Working Men's College, Melbourne. 

 rpERTIARY geology in South-Eastern Australia has been fruitful 

 X of much difference of opinion, partly on account of lithological 

 variations associated with palaeontological variations which have not 

 always received due weight, the difficulty of correlating disconnected 

 outcrops, bores, and shafts, and the degree of antiquity and relative 

 age of the various horizons represented. The various changes in this 

 work have no doubt been a stimulation to some, but to many it has 

 been, and still is, very confusing. 



It happens that marine deposits are well developed, many showing 

 a remarkable wealth of fossils, and these have attracted more attention 

 than their terrestrial and volcanic associates. Amongst the marine 

 fossils, Mollusca are usually very striking, and it is only natural to 

 compare these with Australian living forms. In this way a succession 

 can be determined for the fossil faunas as at present known, showing 

 further and further removes from the living. 



1. Werrikooian. — The type locality is at Limestone Creek, a small 

 tributary of the Glenelg River, in the parish of Werrikoo, South- 

 western Victoria. These beds bear a moUuscan fauna strictly 

 comparable with living forms along the soutliern coast except for 

 the occurrence of a few species at present unknown amongst the 

 living fauna. 



2. Kalinman. — The type locality is near the township of Kalimna, 

 'Gippsland Lakes, Eastern Victoria, The fauna of these beds is also 



comparable in general facies with the recent, in the proportion of 

 bivalves to univalves, and relative abundance of representatives 

 of other groups. It includes extinct genera, as well as a very high 

 proportion of extinct species. 



